Cyclophosphate, 8. Mitt. Synthese und Eigenschaften von 8-substituierten Adenosin-3′,5′-Phosphorsäure-benzylestern
作者:Joachim Engels、Alfred Jäger
DOI:10.1002/ardp.19823150416
日期:——
2–12 sind durch Substitution des Broms in 1 durch verschiedene O‐, S‐, Se‐ und N‐Nucleophile zugänglich. Die pKa‐Werte der Ester wurden spektrophotometrisch bestimmt. Mit Phenyldiazomethan wurden diese Di‐ester in einfacher Weise in die Tri‐ester 13–23 übergeführt. Diese als Diastereomerengemisch vorliegenden 1,3,2λ5‐Dioxaphosphorinane lassen sich chromatographisch trennen. Die aufgrund des 31P‐NMR‐Kriteriums
通过用各种O、S、Se和N亲核试剂取代1中的溴,可以获得8-取代的腺苷-3'、5'-磷酸酯(cAMP)2-12。酯的 pKa 值通过分光光度法测定。这些二酯很容易与苯基重氮甲烷转化为三酯 13-23。这些以非对映异构体混合物形式存在的 1,3,2λ5-二氧杂膦烷可以通过色谱法进行分离。现在可以借助 31 H NMR 光谱的化学位移数据确认基于 31 P NMR 标准提出的配置。这种类型的八取代环磷酸盐适合作为亲脂性和细胞渗透性 cAMP 衍生物用于药理学测试。
[EN] SMALL MOLECULE LFA-1 INHIBITORS<br/>[FR] INHIBITEURS DE LFA-1 À PETITES MOLÉCULES
申请人:ALLOCYTE PHARMACEUTICALS AG
公开号:WO2015189265A1
公开(公告)日:2015-12-17
The present invention relates to novel compounds which are capable of inhibiting the interaction of LFA-1 with its counter ligands.
Generation of Phosphoranes Derived from Phosphites. A New Class of Phosphorus Ylides Leading to High <i>E</i> Selectivity with Semi-stabilizing Groups in Wittig Olefinations
作者:Varinder K. Aggarwal、J. Robin Fulton、Chris G. Sheldon、Javier de Vicente
DOI:10.1021/ja029573x
日期:2003.5.1
Tosylhydrazones derived from aryl aldehydes react with t-BuOK, ClFeTPP, (MeO)3P, and aldehydes to furnish olefins with high E selectivity. These reactions occur through a Wittig-type pathway via the corresponding diazo compounds, metal carbenes and phosphorous ylides, with the water-soluble trimethyl phosphate as the byproduct. Similar reactions can also be performed using ethyl diazoacetate; however
源自芳基醛的甲苯磺酰腙与 t-BuOK、ClFeTPP、(MeO)3P 和醛反应以提供具有高 E 选择性的烯烃。这些反应通过相应的重氮化合物、金属卡宾和磷叶立德通过 Wittig 型途径发生,副产物为水溶性磷酸三甲酯。使用重氮乙酸乙酯也可以进行类似的反应;然而,仅在 LiBr 存在下才观察到高 E 选择性。在这种情况下,该反应被认为是通过通过 Arbuzov 反应形成的膦酸阴离子发生的。因此,该烯化反应通过 Horner-Wadsworth-Emmons (HWE) 反应发生,但膦酸阴离子是在完全无碱的条件下生成的。
Stereoselective [4 + 1] Annulation Reactions with Silyl Vinylketenes Derived from Fischer Carbene Complexes
作者:William H. Moser、Laura A. Feltes、Liangdong Sun、Matthew W. Giese、Ryan W. Farrell
DOI:10.1021/jo060994x
日期:2006.8.1
Stable silyl vinylketenes were prepared via the thermal reaction of Fischercarbenecomplexes with triisopropylsilyl- or tert-butyldimethylsilyl-substituted alkynes. The ability of these silyl vinylketenes to participate with carbenoid reagents in [4 + 1] annulation reactions was investigated. The best results were obtained with diazomethane and substituted diazomethane reagents, which provided cyclopentenone
7-Methyl- and 7-phenylcyclohepta-1, 3, 5-trienes from benzvalene via 3, 3a, 4, 5, 6, 6a-hexahydro-4, 5, 6-methenocyclopentapyrazoles and tetracyclo[4. 1. 0. 0.0] heptanes
作者:Manfred Christl、Erich Brunn、Wolfgang R. Roth、Hans-Werner Lennartz
DOI:10.1016/s0040-4020(01)80119-8
日期:1989.1
norbornene with both diazoalkanes cannot be rationalized on the basis of frontier orbital energies. On direct photolysis, the pyrazolines 2a-g were converted into the tetracyclo[4. 1. 0. 02,4. 03,5] heptanes 4a-g exclusively. These compounds gave the 1, 3, 5-cycloheptatrienes 5a, b, d, e, g in high yields on treatment with silver ions, thus providing better access to 7, 7-dimethyl-(5d) and 7, 7-diphenylcycloheptatriene